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3x+5-4x=80+16-40x
Multiply both sides of the equation by 4.
-x+5=80+16-40x
Combine 3x and -4x to get -x.
-x+5=96-40x
Add 80 and 16 to get 96.
-x+5+40x=96
Add 40x to both sides.
39x+5=96
Combine -x and 40x to get 39x.
39x=96-5
Subtract 5 from both sides.
39x=91
Subtract 5 from 96 to get 91.
x=\frac{91}{39}
Divide both sides by 39.
x=\frac{7}{3}
Reduce the fraction \frac{91}{39} to lowest terms by extracting and canceling out 13.